下列对妊娠合并心脏病孕妇的处理，正确的是（）。 A.妊娠4个月起，限制食盐的摄入 B

We looked everywhere for the keys, but they are nowhere _______.

A．to find

B．to have found

C．to be found

D．being found

“风暴使树木深深扎根”这句话不仅说明了一种自然现象，更蕴藏了一个深刻的道理。请根据下面的要求答题。

请说出这句话蕴含的道理：_____________________________________________

Marie Sklodowska was the daughter of a Polish teacher. She was a very intelligent little girl; she could read when she was only four years old. Her father taught science at a school in Warsaw. Marie went to his school when she was fourteen years old. She was very interested in science and mathematics, and liked to help his father in his laboratory. She was a very good student and left school with a gold medal.

Marie wanted to be a scientist like her father. In 1891 her sister Bronya invited her to go to Paris. There she began to learn science and mathematics at the famous university of the Sorbonne. At first Marie could speak only a little French, but he worked hard and soon passed her examination. In Paris Marie met another scientist Pierre Curie, and in 1895 she married him.

In 1898 both the Curies decided to investigate the radioactive elements in pitchblende. The Austrians gave them a lot of pitchblende for their work, and the Curies began to experiment with it slowly and carefully. They worked hard for four years, and at last Marie obtained a very small piece of radioactive element—radium. It weighed only one tenth of a gramme, but it was pure radium and it shone with a wonderful light. The new element was valuable to science, but it was beautiful too.

46. Which of the following statements is true?

A. Marie left a gold medal because she was a good student.

B. Marie left school because she was a good student.

C. Marie received a gold medal because she was a good student

D. Marie left school because she wasn’t a good student.

47. Marie’s father ______ in Warsaw.

A. was an English teacher         B. learned science at a school

C. was a science teacher          D. taught Polish at a school

48. In 1891 Marie could ______.

A. speak only a little Polish

B. not speak French at all

C. speak only a little science    

D. speak only a little French

49. In Paris Marie met ______.

A. another science                 B. another scientist

C. another scientific work         D. scientific labs

50. The radium ______ one tenth of a gramme.

A. shone      B. experimented      C. obtained     D. weighed

黄酮类化合物显色是因为

A．具色原酮
B．具2-苯基色原酮
C．具色原酮和助色团
D．具2-苯基色原酮和助色团
E．具有黄烷醇和助色团

联合关节