单项选择题

A．In a college bookstore.
B．In a lecture hall.
C．In a library.
D．In a dormitory.
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单项选择题
A．He looks happier lately.B．He manages his time well.C．He’s improved the way he looks.D．He follows directions more carefully now.
A．He looks happier lately.
B．He manages his time well.
C．He’s improved the way he looks.
D．He follows directions more carefully now.
填空题
If the storage problem is ______ and ______, a network of hydrogen stations and the transportation infrastructure will have to develop around it.
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