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It can be inferred that the writer thinks engineering curricula are ______.

A. strengthened when they include courses in design
B. weakened by the courses designed to develop mathematical skills
C. weak because they include some non-scientific components
D. strong despite the absence of nonscientific modes of thinking

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It can be inferred from Paragraph 3 that ______.

A. shippers will be charged less without a rival railroad
B. all shippers are served by only one rail company
C. overcharged shippers are unlikely to appeal for rate relief
D. a government board ensures fair play in railway business

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A．Because church wedding is romantic.B．Because Diana is a catholic.C．Because her paren

A. Because church wedding is romantic.
Because Diana is a catholic.
C. Because her parents ask her to do so.
D. Because David likes church wedding.

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听力原文： America's national symbol, the bald eagle, almost went extinct 20 years ago. But it has made a comeback. In fact, the U. S. Fish and Wildlife Service is considering the possibility of taking it off the endangered-species list.
Once, more than 50,000 pairs of bald eagles nested across the country. But by 1960, that number had fallen below 400.
The chief killer was the widely used DDT. Fish soaked up DDT, died, and were washed up on shores, where bald eagles feasted on them. DDT prevented eagle eggshells from thickening. The shells became so thin that they shattered before the babies hatched.
Fortunately, in 1972, a law was passed to ban DDT, which saved the bald eagle from total wipeout. And since then, wildlife biologists have reintroduced bald eagles from Canada to America. The result was that last year U. S. birdwatchers counted 11, 610 bald eagles in the country.
If it were dropped from the endangered list, the bald eagle would still be a " threatened species.” That means the bird would continue to get the same protection - no hunting allowed, and no disturbing of nests.
But bald eagles still face tough times. The destruction of their natural homes could be the next DDT causing eagle numbers to drop quickly.
(30)

A. It limited their supply of food.
B. It made their eggshells to fragile.
C. It destroyed many of their nests.
D. It killed man baby bald eagles.

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A．Big waves pose a threat to commercial navigation.B．The river current never flows fas

A. Big waves pose a threat to commercial navigation.
B. The river current never flows faster ten miles per hour.
C. The river reverses its flow several times a day.
D. High tides can create sudden and unexpected rapids.

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It can be inferred that the writer thinks engineering curricula are ______.

A. strengthened when they include courses in design B. weakened by the courses designed to develop mathematical skills C. weak because they include some non-scientific components D. strong despite the absence of nonscientific modes of thinking

It can be inferred from Paragraph 3 that ______.

A．Because church wedding is romantic.B．Because Diana is a catholic.C．Because her paren

A．Big waves pose a threat to commercial navigation.B．The river current never flows fas

A. strengthened when they include courses in design
B. weakened by the courses designed to develop mathematical skills
C. weak because they include some non-scientific components
D. strong despite the absence of nonscientific modes of thinking