问题： [单选,材料题] It can be felt from the description in the 2nd paragraph that the author 根据以下资料，回答下面的题目。Snowflakes What does Professor Libbrecht believe to be true? A . admires the beauty of the snowflakes．B . dislikes the changing growth history of the snowflakes．C . has a particular feeling for those flower—like crystals．D . Iikes to compare snowflakes to the stars in the sky．
帮考士![[单选] He noticed that Joan was studying him closely, but her expression gave away nothing of what s](http://bangkaoshi.com/zb_users/theme/yd1125free/include/random/4.jpg)
![[单选,材料题] The forty years from the 1930s to the 1970s was an important period](http://bangkaoshi.com/zb_users/theme/yd1125free/include/random/2.jpg)
![[单选] I tried very hard to persuade him to join our groups but I met with flat refusal.](http://bangkaoshi.com/zb_users/theme/yd1125free/include/random/7.jpg)
![[单选] He failed to carry out some of the provisions of the contract, and now he has to take charge o](http://bangkaoshi.com/zb_users/theme/yd1125free/include/random/3.jpg)
