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【单选题】
受精过程中顶体释放透明质酸酶的主要作用是（ ）A.
溶解透明带
B.
溶解放射冠
C.
溶解卵黄膜
D.
溶解卵质膜
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】My father didn't fly to London for the opening ceremony, because his doctor suggested that he ______ there.
A.
not to go
B.
hadn't gone
C.
not go
D.
wouldn't go
【单选题】---- I haven’t got the ticket for the opening ceremony of the 2010 Shanghai World Expo. ---- Don’t worry. It’ll be broadcast_______ on April 30. Don’t miss it.
A.
lively
B.
alive
C.
live
D.
living
【单选题】―We didn’t see Robert at the opening ceremony yesterday. ―No, he _______ it.
A.
mustn’t have attended
B.
needn’t have attended
C.
needn’t attend
D.
didn’t need to attend
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