The number of air crashes that ____ in d

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问题选择题

The number of air crashes that ____ in developing countries ____ increasing. [ ]

A. happens; is

B. happen; is

C. happens; are

D. happen; are

答案

答案：B

单项选择题

蛔虫

A．以肠内容物为食
B．以血液及肠黏膜为食
C．以组织液和体液为食
D．以肠内容物、组织或血液为食
E．以淋巴液为食

选择题

I like houses near the seaside, but I don't have enough money to buy ________. [ ]

A. it

B. this

C. that

D. one