Which country made travel restrictions before
America.
B. Mexico.
C. Canada.
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What will the man do
A. Take the refrigerator away.
Buy some groceries.
C. Pick out other appliances.
Few people realize ______.
A. how quickly many species of cacti are becoming extinct
B. how quickly much species of cacti is becoming extinct
C. how quickly are many species of cacti becoming extinct
D. how quickly is much species of cacti becoming extinct
对CO中毒有诊断价值的是
A. 碳氧血红蛋白测定
B. 胆碱酯酶活力测定
C. 淀粉酶测定
D. 心肌酶测定
E. 碱性磷酸酶测定
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