A Canadian researcher has discovered that sound travels (21) air more than one-half kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who learned they had been (22) the wrong speed of sound for many years.
The speed of sound in air had been (23) to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, (24) accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.
Doctor Wong is a member of the National Research Council of Canada. He was studying ways to (25) exactly the sound created by microphones. One of his experiments (26) a number he could use to find the speed of sound. He was (27) to learn that the speed of sound was slower than scientists had thought.
To explain the difference, Doctor Wong spent eighteen mon
A. thought
B. considered
C. considering
D. thinking
2岁女孩，因生长发育落后，智力发育落后来诊。此患儿出生后即有吃奶差，腹胀、便秘，少哭、少动；哭声嘶哑，近2～3个月出现面部、眼睑水肿。至今不会说话、不会走路。体检：体温35.7℃，心率66次/分，呼吸22次/分，皮肤粗糙，毛发干燥，表情呆滞，声音嘶哑，眼距宽，鼻梁低平，舌伸出口外，面部眼睑水肿，双肺听诊无哕音，心音低钝，腹膨隆，有脐疝，四肢肌张力弱。
应选择的最佳治疗药物是（）
In June 1985, two British mountaineers Joe Simpson and Simon Yates made the first-ever climb of the 21,000-foot snow-covered Siula Grande mountain in Peru. It was an exceptionally (26) job, but nothing compared to what was to (27) . Early in the process, Simpson (28) and broke his right knee. Yates could have (29) him but managed to find a way of (30) him down the mountains on a rope in a series of difficult drops. Then Simpson fell into a crevasse and Yates eventually had no (31) but to cut the (32) , completely convinced that his friend was now (33)
In his book on the (34) , Joe Simpson wrote:
(35) I looked at the distant moraines, I know that I must at least try I would probably (36) there among those rocks. If I died, well, that wasn’t so (37) , but I wouldn’t have (38) waited for it to happen. The (39) of dying no longer affecte
A. brought
B. pushed
C. carried
D. dropped
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