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【单选题】
Addition of any chemical compound to the environment in quantities ______ a significant fraction of the total content of gasoline may have unexpected environmental consequences.A.
that constitute
B.
which constitutes
C.
that are substituted by
D.
which substitute
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【单选题】听力原文：W: Mr. Smith has just said that if I am late again he will fire me. M: Don't let it get you down. He always says like that. Q: What does the man mean? (15)
A.
Mr. Smith is very kind.
B.
The woman should not worry.
C.
He is worried, too.
D.
He likes Mr. Smith.