填空题

Amniocentesis can reveal whether a fetus is suffering from any of a variety of chromosomal defect（）.

【参考答案】

defect→defects

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单项选择题

A．A crate of orange were
B．A crate of oranges were
C．A crate of orange was
D．A crate of oranges was

填空题

We might say that the earliest tools were a means of extending the human being own bodily powers（）.