单项选择题

Living in the desert of Africa has its problems;（）obtaining fresh water is not the least.

A、 with which
B 、for which
C、 of which
D、 which

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单项选择题

We all see（）her and know what kind of woman she is.

A、as
B、through
C、to
D、off

单项选择题

Helen was much kinder to her youngest child than she was to the others,（）of course, made the others jealous.

A.what
B.who
C.which
D.that

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