题目内容

该病自婴儿至成人均可发病，以()儿童多见

A. 1～2岁
B. 0～1岁
C. 3～9岁
D. 9～10岁
E. 10～13岁

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When the bell sounded, the boys rushed out of the classroom, each______ a number of new books under his arm.

A. had carried
B. to carry
C. to be carried
D. carrying

Frequently single-parent children take on some of the functions that the absent adult in the house______.

A. has served
B. would have served
C. serves
D. must serve

Just consider that we use hardly one hundred-thousandth of the heat______in coal and that

A. it is
B. there is
C. as is
D. what is

公共汽车上不允许吸烟，人人都要自觉zun 守。