(1) Psychological research has____a number of basic principl

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(1) Psychological research has____a number of basic principles that help memory.
A concentrate in
B engaged in
C involved in
D focused on
(2) Diamonds are made____carbon.
A of
B up of
C from
D in
(3) Silver ornament is becoming popular____girls nowadays.
A towards
B with
C to
D for

1.D
固定短语concentrate on,不是concentrate in,排除A；
固定短语be engaged in和be involved in,排除BC.
2.C
be made of是指“成品里面能看见原材料”的,“钻石”里面肯定是用肉眼看不到“碳”的,所以必须用be made from.
3.B
固定短语：be popular with/among sb,意思是“在...中广受欢迎”.
再问：请问这题呢~？能帮我解答一下么，谢谢 4 Diamonds are made____carbon. A of B up of C from D in

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